JP2006104505A - Induction heat treatment apparatus, induction heat treatment method, and wrought product manufactured by the method - Google Patents

Induction heat treatment apparatus, induction heat treatment method, and wrought product manufactured by the method Download PDF

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JP2006104505A
JP2006104505A JP2004290314A JP2004290314A JP2006104505A JP 2006104505 A JP2006104505 A JP 2006104505A JP 2004290314 A JP2004290314 A JP 2004290314A JP 2004290314 A JP2004290314 A JP 2004290314A JP 2006104505 A JP2006104505 A JP 2006104505A
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temperature
tempering
heating
heat treatment
measuring
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Takumi Fujita
工 藤田
Nobuyuki Suzuki
伸幸 鈴木
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NTN Corp
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NTN Toyo Bearing Co Ltd
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Priority to CNA2005800329516A priority patent/CN101031662A/en
Priority to PCT/JP2005/017695 priority patent/WO2006038488A1/en
Priority to US11/664,272 priority patent/US20080087358A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat treatment apparatus for induction-tempering an article while controlling the temperature, and to provide a heat treatment method therefor. <P>SOLUTION: The induction heat treatment apparatus is directed at heating and tempering an article to be treated by using a high-frequency power, and has a temperature control means for adjusting the temperature of the article during heating. The temperature control means preferably comprises: the heating means for heating the article to be treated by using a high-frequency power; a temperature-measuring means for controlling the temperature, which measures the temperature of the article to be heated by the heating means; a thermoregulation means which is connected to the temperature-measuring means and outputs a temperature control signal to the heating means on the basis of temperature information sent from the temperature-measuring means; and further a temper-controlling means having a tempering-temperature-measuring means for measuring a tempering temperature of the article to be heated by the heating means, and a tempering-time-adjusting means which is connected to the temperature-measuring means and adjusts a tempering period of time on the basis of temperature information sent from the temperature-measuring means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、鋼の高周波熱処理方法に関し、より特定的には、鋼の高周波焼戻方法に関する。また、そのための装置およびその方法により製造した加工製品に関する。   The present invention relates to an induction heat treatment method for steel, and more particularly to an induction tempering method for steel. Moreover, it is related with the apparatus for that, and the processed product manufactured by the method.

鋼の焼戻処理は、靭性及び寸法安定性の向上を目的として焼入品に施されている。焼戻の条件は、鋼種ごとに温度で規定される場合が多く、保持時間を製品の肉厚によって多少変化させているのが一般的である。これは、焼戻の効果が、保持時間の影響よりも温度の影響を支配的に受けるためである。焼戻処理の工数を低減する上では、高温短時間の焼戻処理が考えられる。また、従来より、焼戻の効果は、次式で表される焼戻パラメータＰを用いて、焼戻温度Ｔと焼戻時間ｔから換算できることが知られている（非特許文献１参照）。   The tempering treatment of steel is performed on the quenched product for the purpose of improving toughness and dimensional stability. The tempering conditions are often specified by the temperature for each steel type, and the holding time is generally slightly changed depending on the thickness of the product. This is because the tempering effect is predominantly affected by temperature rather than by the retention time. In order to reduce the number of man-hours for tempering, tempering at a high temperature for a short time can be considered. Conventionally, it is known that the effect of tempering can be converted from the tempering temperature T and the tempering time t using the tempering parameter P represented by the following equation (see Non-Patent Document 1).

Ｐ＝Ｔ｛ｌｏｇ（ｔ）＋Ｃ｝
この式は、同じ焼戻効果を得るために必要な温度と時間を表したものであるが、より実用的なものとするために、材料強度と焼戻温度、焼戻時間の関係を示す次式が知られている（特許文献１参照）。 P = T {log (t) + C}
This equation expresses the temperature and time required to obtain the same tempering effect, but in order to make it more practical, it shows the relationship between material strength, tempering temperature, and tempering time. The equation is known (see Patent Document 1).

Ｘ＝１−ｅｘｐ｛−（ｋｔ）Ｎ｝
ｋ＝Ａｅｘｐ（−Ｑ／ＲＴ）
Ｍ＝Ｍ０−（Ｍ０−Ｍｆ）Ｘ
（式中、Ｘ：機械的性質の変化率、ｋ：反応速度係数、ｔ：焼戻時間、Ｎ：時間指数、Ａ：振動因子項、Ｑ：活性化エネルギ、Ｒ：気体定数、Ｔ：焼戻温度、Ｍ：焼戻硬度、Ｍ０：焼入硬度、Ｍｆ：生材硬度を表す。）
これらの式により、温度と時間による焼戻の効果を知ることができるが、一般的には、高温短時間の焼戻処理は行なわれていないのが現状である。これは、焼戻炉内で焼戻ムラを発生させないためである。焼戻では、多量の被処理物を一度に処理をする場合が多いので、形状（肉厚）、処理量等によっては、炉内の焼戻状況にバラツキが発生する。したがって、多量の被処理物を一度に処理をする場合の処理条件は、焼戻状況のバラツキが生じにくい、比較的低温で長時間の処理になる。 X = 1-exp {-(kt) N }
k = Aexp (−Q / RT)
M = M 0 − (M 0 −M f ) X
(Where, X: rate of change of mechanical properties, k: reaction rate coefficient, t: tempering time, N: time index, A: vibration factor term, Q: activation energy, R: gas constant, T: calcination tempering temperature, M: tempering hardness, M 0: represents the green wood hardness): hardness after quenching, M f.
Although the tempering effect according to temperature and time can be known from these equations, in general, the tempering process at high temperature and short time is not currently performed. This is because tempering unevenness does not occur in the tempering furnace. In tempering, a large amount of objects to be processed are often processed at a time, so that the tempering condition in the furnace varies depending on the shape (thickness), the processing amount, and the like. Therefore, the processing conditions for processing a large amount of objects to be processed at a time are relatively low temperature and long-time processing, in which variations in tempering conditions are unlikely to occur.

高温短時間での焼戻に適した処理方法としては、製品の熱処理を個々に行なうことができる高周波熱処理法がある。高周波焼戻による急速加熱焼戻は、通常の大気炉の焼戻と比較して、高性能な材質を得ることができるとの報告がある（非特許文献２及び非特許文献３参照）。しかし、あまり一般的な処理とはいえない。その理由は、温度制御が行なえないため、条件出しに手間がかかることに基くものであると考えられる。
特開平１０−１０２１３７号公報 Ｊ． Ｈ． Ｈｏｌｌｏｍｏｎ ａｎｄ Ｌ． Ｄ． Ｊａｆｆｅ、Ｔｒａｎｓ． Ｍｅｔ． ｓｏｃ． ＡＩＭＥ、１６２、１９４５年、ｐ．２２３ 川嵜ら、「鉄と鋼」、７４巻、１９８８年、ｐ．３３４ 川嵜ら、「鉄と鋼」、７４巻、１９８８年、ｐ．３４２ As a treatment method suitable for tempering at a high temperature in a short time, there is a high-frequency heat treatment method capable of individually heat-treating products. There is a report that rapid heating and tempering by induction tempering can obtain a high-performance material as compared with normal tempering in an atmospheric furnace (see Non-Patent Document 2 and Non-Patent Document 3). However, it is not a very general process. The reason is considered to be based on the fact that the temperature control cannot be performed and therefore it takes time to find the conditions.
JP-A-10-102137 J. et al. H. Hollomon and L.M. D. Jaffe, Trans. Met. soc. AIME, 162, 1945, p. 223 Kawamata et al., “Iron and Steel”, 74, 1988, p. 334 Kawamata et al., “Iron and Steel”, 74, 1988, p. 342

本発明の課題は、温度制御による高周波焼戻を行なう熱処理装置及びその処理方法およびその方法により製造した加工製品を提供することにある。   An object of the present invention is to provide a heat treatment apparatus for performing induction tempering by temperature control, a treatment method thereof, and a processed product manufactured by the method.

本発明の高周波熱処理装置は、高周波により被処理物を加熱して焼戻をする熱処理装置であって、加熱する被処理物の温度を調節する温度制御手段を備えることを特徴とする。温度制御手段は、高周波により被処理物を加熱する加熱手段と、加熱手段により加熱される被処理物の温度を測定する温度制御用測温手段と、この測温手段に接続して測温手段からの温度情報に基き温度制御信号を加熱手段に出力する温度調節手段とを有し、
さらに、加熱手段により加熱される被処理物の焼戻温度を測定する焼戻用測温手段と、この測温手段に接続して測温手段からの温度情報に基き焼戻時間を調節する焼戻時間調節手段とを有する焼戻制御手段
を備える態様が好ましい。焼戻時間調節手段は、
ｔ＝〔ｌｎ｛（Ｍ０−Ｍｆ）／（Ｍ−Ｍｆ）｝×｛Ａｅｘｐ（−Ｑ／ＲＴ）｝−Ｎ〕１／Ｎ
（式中、ｔ：焼戻時間、Ｍ０：焼入硬度、Ｍｆ：生材硬度、Ｍ：焼戻硬度、Ａ：振動因子項、Ｑ：活性化エネルギ、Ｒ：気体定数、Ｔ：焼戻温度、Ｎ：時間指数を表す。）により焼戻時間を調節する態様が好ましい。 The high-frequency heat treatment apparatus of the present invention is a heat treatment apparatus for heating and tempering an object to be processed by high frequency, and is characterized by comprising temperature control means for adjusting the temperature of the object to be heated. The temperature control means includes a heating means for heating the object to be processed by high frequency, a temperature measuring temperature measuring means for measuring the temperature of the object to be processed heated by the heating means, and a temperature measuring means connected to the temperature measuring means. Temperature adjusting means for outputting a temperature control signal to the heating means based on the temperature information from
Furthermore, a tempering temperature measuring means for measuring the tempering temperature of the workpiece heated by the heating means, and a tempering time connected to the temperature measuring means to adjust the tempering time based on temperature information from the temperature measuring means. An aspect provided with a tempering control means having a return time adjusting means is preferable. Tempering time adjustment means
t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
(Where, t: tempering time, M 0 : quenching hardness, M f : raw material hardness, M: tempering hardness, A: vibration factor term, Q: activation energy, R: gas constant, T: tempering A mode in which the tempering time is adjusted by a rewinding temperature, N: represents a time index) is preferable.

本発明の高周波熱処理方法は、高周波により被処理物を加熱して焼戻をする熱処理方法であって、加熱する被処理物の温度を調節する温度制御工程と、焼戻温度を測定し焼戻時間を調節する焼戻制御工程とを備え、
温度制御工程は、高周波により被処理物を加熱する加熱工程と、加熱された被処理物の温度を測定する温度制御用測温工程と、測定した温度情報に基き温度制御信号を出力して被処理物への加熱を制御する温度調節工程とを有し、
焼戻制御工程は、加熱される被処理物の焼戻温度を測定する焼戻用測温工程と、測定した温度情報に基き焼戻時間を調節する焼戻時間調節工程とを有することを特徴とする。焼戻時間調節工程は、
ｔ＝〔ｌｎ｛（Ｍ０−Ｍｆ）／（Ｍ−Ｍｆ）｝×｛Ａｅｘｐ（−Ｑ／ＲＴ）｝−Ｎ〕１／Ｎ
により焼戻時間を調節する態様が好ましい。本発明の加工製品は、かかる高周波熱処理方法により製造したことを特徴とする。 The induction heat treatment method of the present invention is a heat treatment method for heating and tempering an object to be processed by high frequency, a temperature control step for adjusting the temperature of the object to be heated, and a tempering temperature measurement. A tempering control process for adjusting time,
The temperature control process includes a heating process for heating the object to be processed with high frequency, a temperature control temperature measuring process for measuring the temperature of the heated object to be processed, and a temperature control signal based on the measured temperature information. A temperature adjustment step for controlling heating of the processed object,
The tempering control step includes a tempering temperature measuring step for measuring the tempering temperature of the object to be heated, and a tempering time adjusting step for adjusting the tempering time based on the measured temperature information. And The tempering time adjustment process
t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
The aspect which adjusts tempering time by is preferable. The processed product of the present invention is manufactured by such a high-frequency heat treatment method.

本発明によれば、高周波による高温短時間の焼戻処理が可能となり、焼戻工数を低減できるとともに高性能な加工品を得ることが可能である。また、材料の種類を問わず、所定の熱処理品質を得ることができる。   According to the present invention, it is possible to perform a tempering process at a high temperature and a short time by using a high frequency, thereby reducing the number of tempering steps and obtaining a high-performance processed product. Moreover, a predetermined heat treatment quality can be obtained regardless of the type of material.

本発明の高周波熱処理装置は、被処理物の温度を調節する温度制御手段を備え、高周波により被処理物を加熱して焼戻をすることができる。このため、高温短時間の処理が可能となり、処理工数を低減することができる。また、個々の材料ごとに急速加熱焼戻を行ない、熱処理品質のバラツキを低減し、高性能な加工品を製造することができる。   The induction heat treatment apparatus of the present invention includes temperature control means for adjusting the temperature of an object to be processed, and can temper the object to be processed by high frequency. For this reason, high-temperature and short-time processing is possible, and the number of processing steps can be reduced. Moreover, rapid heating and tempering can be performed for each individual material, variation in heat treatment quality can be reduced, and a high-performance processed product can be manufactured.

温度制御手段は、典型的には、図１に示すように、高周波により被処理物１を加熱する加熱手段２と、加熱手段２により加熱される被処理物１の温度を測定する温度制御用測温手段３と、温度制御用測温手段３に接続して測温手段からの温度情報に基き温度制御信号を加熱手段２に出力する温度調節手段４とを有する態様が好ましい。   As shown in FIG. 1, the temperature control means typically has a heating means 2 that heats the workpiece 1 with high frequency and a temperature control that measures the temperature of the workpiece 1 heated by the heating means 2. An embodiment having a temperature measuring means 3 and a temperature adjusting means 4 connected to the temperature measuring temperature measuring means 3 and outputting a temperature control signal to the heating means 2 based on temperature information from the temperature measuring means is preferable.

一方、焼戻制御手段は、加熱手段２により加熱される被処理物１の焼戻温度を測定する焼戻用測温手段５と、焼戻用測温手段５に接続して測温手段からの温度情報に基き焼戻時間を調節する焼戻時間調節手段６とを有する態様が好ましい。焼戻温度を測定する測温手段（温度計）は、複数設置する態様がより好ましい。温度計を複数設置することにより、被処理物内における温度ムラを小さくし、焼戻品質を被処理物上の複数の場所で管理できる。温度計の種類は、放射温度計を用いることができる。また、装置のレイアウトにより、接触式温度計を用いることもできる。   On the other hand, the tempering control means is connected to the tempering temperature measuring means 5 for measuring the tempering temperature of the workpiece 1 heated by the heating means 2, and the tempering temperature measuring means 5 connected to the tempering temperature measuring means 5. A mode having tempering time adjusting means 6 for adjusting the tempering time based on the temperature information is preferable. More preferably, a plurality of temperature measuring means (thermometers) for measuring the tempering temperature are installed. By installing a plurality of thermometers, temperature unevenness in the workpiece can be reduced, and tempering quality can be managed at a plurality of locations on the workpiece. As the type of thermometer, a radiation thermometer can be used. A contact thermometer can also be used depending on the layout of the apparatus.

本発明の高周波熱処理装置について、ＳＵＪ２製６２０６型番外輪を被処理材として例示し、具体的に説明する。この被処理材は、ＲＸ雰囲気炉にて８５０℃で焼入したものである。ここでは、ＳＵＪ２材の熱処理規格として、強度の観点から、焼戻硬度をＨＲＣ６２以下で、ＨＲＣ５８以上と設定する。   The high-frequency heat treatment apparatus of the present invention will be described in detail by exemplifying a SUJ2 6206 model number outer ring as a material to be treated. This material to be treated is hardened at 850 ° C. in an RX atmosphere furnace. Here, as a heat treatment standard for the SUJ2 material, the tempering hardness is set to HRC 62 or less and HRC 58 or more from the viewpoint of strength.

材料強度、焼戻温度と焼戻時間との間には、特許文献１に示すように次の関係式が成立する。   As shown in Patent Document 1, the following relational expression is established among the material strength, the tempering temperature, and the tempering time.

Ｘ＝１−ｅｘｐ｛−（ｋｔ）Ｎ｝
ｋ＝Ａｅｘｐ（−Ｑ／ＲＴ）
Ｍ＝Ｍ０−（Ｍ０−Ｍｆ）Ｘ
式中、Ｘ：機械的性質の変化率、ｋ：反応速度係数、ｔ：焼戻時間、Ｎ：時間指数、Ａ：振動因子項、Ｑ：活性化エネルギ、Ｒ：気体定数、Ｔ：焼戻温度、Ｍ：焼戻硬度、Ｍ０：焼入硬度、Ｍｆ：生材硬度を表す。 X = 1-exp {-(kt) N }
k = Aexp (−Q / RT)
M = M 0 − (M 0 −M f ) X
In the formula, X: rate of change of mechanical properties, k: reaction rate coefficient, t: tempering time, N: time index, A: vibration factor term, Q: activation energy, R: gas constant, T: tempering temperature, M: tempering hardness, M 0: representing the green wood hardness: quenching hardness, M f.

したがって、これらの式から焼戻時間ｔについての次式を導くことができる。   Therefore, the following equation for the tempering time t can be derived from these equations.

ｔ＝〔ｌｎ｛（Ｍ０−Ｍｆ）／（Ｍ−Ｍｆ）｝×｛Ａｅｘｐ（−Ｑ／ＲＴ）｝−Ｎ〕１／Ｎ
式中の焼入硬度Ｍ０と生材硬度Ｍｆは実測できる。また、ＮとＡとＱは実験的に求めることができるから、焼戻温度Ｔの値を代入して本式により焼戻時間ｔを計算できる。本発明の焼戻時間調節手段は、本式に基き焼戻時間ｔを調節するものである。本式は、熱処理品の規格品質に対する熱処理温度とその保持時間との関係式であるから、被処理物の種類を問わず有効に利用することができる。 t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
Quenching hardness M 0 and green wood hardness M f in the formula can be measured. Further, since N, A, and Q can be obtained experimentally, the value of the tempering temperature T is substituted and the tempering time t can be calculated by this equation. The tempering time adjusting means of the present invention adjusts the tempering time t based on this formula. Since this equation is a relational expression between the heat treatment temperature and the retention time for the standard quality of the heat treated product, it can be used effectively regardless of the type of the object to be treated.

焼戻時間ｔを求める本式により、図２に示すような焼戻温度Ｔと焼戻時間ｔの関係を示す条件線図を作製することができる。図２において、領域ＡはＨＲＣ６２以上の範囲であり、領域ＢはＨＲＣ５８以下の範囲であり、領域ＣがＨＲＣ５８〜６２の範囲である。焼戻条件は、図２からおおよそ求めることができ、焼戻温度が高温になるほど短時間での焼戻が可能になる。このため、焼戻温度は高い方が、熱処理工数の低減という観点からは望ましい。しかし、温度ムラによる焼戻ムラが発生しやすくなると考えられるので、焼戻温度は、工数と焼戻ムラとの兼ね合いなどから決定する態様が好ましい。   A conditional diagram showing the relationship between the tempering temperature T and the tempering time t as shown in FIG. 2 can be produced by this formula for obtaining the tempering time t. In FIG. 2, a region A is a range of HRC 62 or higher, a region B is a range of HRC 58 or lower, and a region C is a range of HRC 58 to 62. The tempering conditions can be roughly obtained from FIG. 2, and the tempering can be performed in a shorter time as the tempering temperature becomes higher. For this reason, a higher tempering temperature is desirable from the viewpoint of reducing the number of heat treatment steps. However, since tempering unevenness due to temperature unevenness is likely to occur, it is preferable that the tempering temperature is determined based on the balance between the man-hour and the tempering unevenness.

焼戻条件が決定すると、図１に示すように、パソコンなどの温度調節手段４に入力する。温度調節手段４は、温度制御用測温手段３と、加熱手段２に接続されており、温度制御用測温手段３からの温度情報に基き、ＰＩＤ制御により温度制御信号を加熱手段２に出力し、被処理物１のヒートパターンを制御する。このとき同時に、焼戻用測温手段５の温度情報をパソコンなどの焼戻時間調節手段６に取り込み、そのヒートパターンから加熱が十分であるかどうかを判断し、焼戻終了タイミングを図る。焼戻用測温手段５からの温度情報は刻一刻と変化するので、Ｍ（焼戻硬度）の値は図３のように積算するのが望ましい。焼戻終了時には冷却液噴射手段７により冷却する。なお、温度調節手段４と焼戻時間調節手段６とを同一のパソコンで兼ねることもできる。   When the tempering conditions are determined, as shown in FIG. 1, the tempering conditions are input to the temperature adjusting means 4 such as a personal computer. The temperature adjusting means 4 is connected to the temperature controlling temperature measuring means 3 and the heating means 2 and outputs a temperature control signal to the heating means 2 by PID control based on the temperature information from the temperature controlling temperature measuring means 3. Then, the heat pattern of the workpiece 1 is controlled. At the same time, the temperature information of the tempering temperature measuring means 5 is taken into the tempering time adjusting means 6 such as a personal computer, and it is judged from the heat pattern whether the heating is sufficient, and the tempering end timing is achieved. Since the temperature information from the tempering temperature measuring means 5 changes every moment, it is desirable to integrate the value of M (tempering hardness) as shown in FIG. At the end of tempering, cooling is performed by the coolant injection means 7. Note that the temperature adjusting means 4 and the tempering time adjusting means 6 can also serve as the same personal computer.

本発明の高周波熱処理方法は、加熱する被処理物の温度を調節する温度制御工程と、焼戻温度を測定し焼戻時間を調節する焼戻制御工程とを備え、温度制御工程は、高周波により被処理物を加熱する加熱工程と、加熱された被処理物の温度を測定する温度制御用測温工程と、測定した温度情報に基き温度制御信号を出力して被処理物への加熱を制御する温度調節工程とを有する。また、焼戻制御工程は、加熱される被処理物の焼戻温度を測定する焼戻用測温工程と、測定した温度情報に基き焼戻時間を調節する焼戻時間調節工程とを有することを特徴とする。 焼戻時間調節工程は、
ｔ＝〔ｌｎ｛（Ｍ０−Ｍｆ）／（Ｍ−Ｍｆ）｝×｛Ａｅｘｐ（−Ｑ／ＲＴ）｝−Ｎ〕１／Ｎ
により焼戻時間を調節することができる。本発明の高周波熱処理方法によれば、高周波による高温短時間の焼戻が可能となり、焼戻工数を低減できるとともに高性能な加工製品を提供することが可能である。また、材料の種類を問わず、所定の熱処理品質を得ることができる。 The high-frequency heat treatment method of the present invention includes a temperature control step for adjusting the temperature of the object to be heated, and a tempering control step for measuring the tempering temperature and adjusting the tempering time. A heating process for heating the workpiece, a temperature measuring process for measuring the temperature of the heated workpiece, and a temperature control signal based on the measured temperature information is output to control the heating of the workpiece. And a temperature adjusting step. The tempering control process includes a tempering temperature measuring process for measuring the tempering temperature of the object to be heated, and a tempering time adjusting process for adjusting the tempering time based on the measured temperature information. It is characterized by. The tempering time adjustment process
t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
Can adjust the tempering time. According to the high-frequency heat treatment method of the present invention, high-temperature and short-time tempering by high-frequency can be performed, and the number of tempering steps can be reduced and a high-performance processed product can be provided. Moreover, a predetermined heat treatment quality can be obtained regardless of the type of material.

実施例１
図１に示す高周波熱処理装置を使用して高周波焼戻処理を行なった。本装置は、温度制御手段と焼戻制御手段とを備え、温度制御手段は、高周波により被処理物１を加熱する加熱手段２であるコイルと、加熱手段２により加熱される被処理物１の温度を測定する温度制御用測温手段３である放射温度計と、この放射温度計に接続して放射温度計からの温度情報に基き温度制御信号を加熱手段２に出力する温度調節手段４であるパソコンとを有する。 Example 1
Induction tempering treatment was performed using the induction heat treatment apparatus shown in FIG. The apparatus includes a temperature control unit and a tempering control unit. The temperature control unit includes a coil that is a heating unit 2 that heats the workpiece 1 with high frequency, and a workpiece 1 that is heated by the heating unit 2. A radiation thermometer that is a temperature control temperature measuring means 3 for measuring temperature, and a temperature adjusting means 4 that is connected to the radiation thermometer and outputs a temperature control signal to the heating means 2 based on temperature information from the radiation thermometer. I have a computer.

焼戻制御手段は、加熱手段２により加熱される被処理物１の焼戻温度を測定する焼戻用測温手段５である放射温度計と、この放射温度計に接続して放射温度計からの温度情報に基き焼戻時間を調節する焼戻時間調節手段６であるパソコンとを有する。焼戻時間調節手段６は、
ｔ＝〔ｌｎ｛（Ｍ０−Ｍｆ）／（Ｍ−Ｍｆ）｝×｛Ａｅｘｐ（−Ｑ／ＲＴ）｝−Ｎ〕１／Ｎ
により焼戻時間ｔを調節した。 The tempering control means includes a radiation thermometer which is a tempering temperature measuring means 5 for measuring the tempering temperature of the workpiece 1 heated by the heating means 2, and a radiation thermometer connected to the radiation thermometer. And a personal computer which is a tempering time adjusting means 6 for adjusting the tempering time based on the temperature information. Tempering time adjusting means 6
t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
The tempering time t was adjusted by

本実施例では、ＳＵＪ２製６２０６型番外輪を被処理材とし、ＲＸ雰囲気炉において８５０℃で焼入したものを使用した。ＳＵＪ２材の熱処理規格としては、焼戻硬度をＨＲＣ６２以下で、ＨＲＣ５８以上と設定した。また、コイルは、高周波電源が８０ｋＨｚのものを用いた。図１においては説明の便宜上、温度制御用測温手段３と焼戻用測温手段５とを別個に示しているが、本実施例では同一の放射温度計を兼用した。焼戻時間は、測温部の硬度がＨＲＣ６０に達するまでとした。決定した条件をパソコンに入力し、ＰＩＤ制御により被処理物１のヒートパターンを制御した。このとき同時に、被処理物１の測温情報をパソコンに取り込み、焼戻時間を調節した。   In this example, a SUJ2 6206 model outer ring was used as a material to be treated, and a material quenched at 850 ° C. in an RX atmosphere furnace was used. As a heat treatment standard for the SUJ2 material, the tempering hardness was set to HRC 62 or less and HRC 58 or more. In addition, a coil having a high frequency power supply of 80 kHz was used. In FIG. 1, for convenience of explanation, the temperature control temperature measuring means 3 and the tempering temperature measurement means 5 are shown separately, but in this embodiment, the same radiation thermometer is also used. The tempering time was set until the hardness of the temperature measuring unit reached HRC60. The determined conditions were input to a personal computer, and the heat pattern of the workpiece 1 was controlled by PID control. At the same time, temperature measurement information of the workpiece 1 was taken into a personal computer and the tempering time was adjusted.

表１に、熱処理条件を変化させたときの高周波焼戻の実験結果を示す。表１に示すように、焼戻温度が高くなるにつれて処理時間は低減できたが、焼戻ムラ（硬度ムラ）が大きくなっていった。しかし、今回の処理の場合、いずれの条件でも設定した品質規格内（ＨＲＣ５８以上で、ＨＲＣ６２以下）の加工製品を得ることができた。   Table 1 shows the experimental results of induction tempering when the heat treatment conditions are changed. As shown in Table 1, the treatment time could be reduced as the tempering temperature increased, but tempering unevenness (hardness unevenness) increased. However, in the case of the current process, it was possible to obtain a processed product within the quality standard set under any condition (HRC 58 or higher and HRC 62 or lower).

Figure 2006104505
Figure 2006104505

今回開示された実施の形態および実施例はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

最短の工数で高周波焼戻を行なうことができ、高品質の熱処理加工品を提供できる。   Induction tempering can be performed with the shortest man-hour, and a high-quality heat-treated product can be provided.

本発明の高周波熱処理装置の典型的な構造を示す模式図である。It is a schematic diagram which shows the typical structure of the high frequency heat processing apparatus of this invention. 焼戻温度と焼戻時間の関係を示すＳＵＪ２材の条件線図である。It is a condition diagram of SUJ2 material which shows the relationship between tempering temperature and tempering time. 焼戻温度と焼戻時間との関係を示す説明図である。It is explanatory drawing which shows the relationship between tempering temperature and tempering time.

符号の説明Explanation of symbols

１ 被処理物、２ 加熱手段、３ 温度制御用測温手段、４ 温度調節手段、５ 焼戻用測温手段、６ 焼戻時間調節手段。   1 to-be-processed object, 2 heating means, 3 temperature measuring means for temperature control, 4 temperature adjusting means, 5 temperature measuring means for tempering, 6 tempering time adjusting means.

Claims (6)

高周波により被処理物を加熱して焼戻をする熱処理装置であって、加熱する被処理物の温度を調節する温度制御手段を備えることを特徴とする高周波熱処理装置。   A heat treatment apparatus for heating and tempering an object to be processed by high frequency, comprising a temperature control means for adjusting a temperature of the object to be heated. 前記温度制御手段は、高周波により被処理物を加熱する加熱手段と、加熱手段により加熱される被処理物の温度を測定する温度制御用測温手段と、該測温手段に接続して該測温手段からの温度情報に基き温度制御信号を加熱手段に出力する温度調節手段とを有し、
さらに、加熱手段により加熱される被処理物の焼戻温度を測定する焼戻用測温手段と、該測温手段に接続して該測温手段からの温度情報に基き焼戻時間を調節する焼戻時間調節手段とを有する焼戻制御手段
を備えることを特徴とする請求項１に記載の高周波熱処理装置。 The temperature control means includes a heating means for heating the object to be processed by high frequency, a temperature measuring temperature measuring means for measuring the temperature of the object to be processed heated by the heating means, and the temperature measuring means connected to the temperature measuring means for the measurement. Temperature adjusting means for outputting a temperature control signal to the heating means based on temperature information from the temperature means,
Further, a tempering temperature measuring means for measuring the tempering temperature of the workpiece heated by the heating means, and the tempering time is adjusted based on temperature information from the temperature measuring means connected to the temperature measuring means. The induction heat treatment apparatus according to claim 1, further comprising a tempering control unit having a tempering time adjusting unit. 前記焼戻時間調節手段は、
ｔ＝〔ｌｎ{（Ｍ0−Ｍf）／(Ｍ−Ｍf)}×{Ａｅｘｐ（−Ｑ／ＲＴ）｝-N〕1/N
（式中、ｔ：焼戻時間、Ｍ0：焼入硬度、Ｍf：生材硬度、Ｍ：焼戻硬度、Ａ：振動因子項、Ｑ：活性化エネルギ、Ｒ：気体定数、Ｔ：焼戻温度、Ｎ：時間指数を表す。）により焼戻時間を調節することを特徴とする請求項２に記載の高周波熱処理装置。 The tempering time adjusting means includes
t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
(Where, t: tempering time, M 0 : quenching hardness, M f : raw material hardness, M: tempering hardness, A: vibration factor term, Q: activation energy, R: gas constant, T: tempering 3. The induction heat treatment apparatus according to claim 2, wherein the tempering time is adjusted by a rewinding temperature, N: representing a time index. 高周波により被処理物を加熱して焼戻をする熱処理方法であって、加熱する被処理物の温度を調節する温度制御工程と、焼戻温度を測定し焼戻時間を調節する焼戻制御工程とを備え、
前記温度制御工程は、高周波により被処理物を加熱する加熱工程と、加熱された被処理物の温度を測定する温度制御用測温工程と、測定した温度情報に基き温度制御信号を出力して被処理物への加熱を制御する温度調節工程とを有し、
前記焼戻制御工程は、加熱される被処理物の焼戻温度を測定する焼戻用測温工程と、測定した温度情報に基き焼戻時間を調節する焼戻時間調節工程とを有することを特徴とする高周波熱処理方法。 A heat treatment method for tempering by heating a workpiece by high frequency, a temperature control step for adjusting the temperature of the workpiece to be heated, and a tempering control step for measuring a tempering temperature and adjusting a tempering time. And
The temperature control step outputs a temperature control signal based on the heating step of heating the workpiece by high frequency, the temperature measuring step for measuring the temperature of the heated workpiece, and the measured temperature information. A temperature adjusting step for controlling heating of the workpiece,
The tempering control step includes a tempering temperature measuring step for measuring the tempering temperature of the object to be heated, and a tempering time adjusting step for adjusting the tempering time based on the measured temperature information. A featured high frequency heat treatment method. 前記焼戻時間調節工程は、
ｔ＝〔ｌｎ{（Ｍ0−Ｍf）／(Ｍ−Ｍf)}×{Ａｅｘｐ（−Ｑ／ＲＴ）｝-N〕1/N
により焼戻時間を調節することを特徴とする請求項４に記載の高周波熱処理方法。 The tempering time adjusting step includes
t = [ln {(M 0 −M f ) / (M−M f )} × {Aexp (−Q / RT)} −N ] 1 / N
The induction heat treatment method according to claim 4, wherein the tempering time is adjusted by: 請求項４または５に記載の高周波熱処理方法により製造した加工製品。   A processed product produced by the induction heat treatment method according to claim 4 or 5.
JP2004290314A 2004-10-01 2004-10-01 Induction heat treatment apparatus, induction heat treatment method, and wrought product manufactured by the method Withdrawn JP2006104505A (en)

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